JP2005118844A - Work roll position adjusting method and rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work roll position adjusting method and a rolling mill capable of easily making the crossing angle or offset of upper and lower work rolls within an allowable range.
At least one of the divided backup rolls 21 to 27 of any one of the upper and lower roll assemblies 10 and 40 is an independent reduction device 301 to 307, 601 to 607, load measuring device 321, 327, 621 to 627. In the rolling mill equipped with the rolling position measuring devices 341 to 347 and 641 to 647, the thrust load acting in the roll axial direction of at least one of the upper and lower work rolls 13 and 43 is measured. By adjusting the reduction positions of the divided backup rolls 21 to 27 based on the measured values and giving a rigid rotational displacement in a horizontal plane to at least one of the upper and lower work rolls 13 and 43, the upper and lower work rolls 13 and 43 Maintains constant increase / decrease in thrust force.
[Selection] Figure 1

Description

  The present invention relates to a work roll position adjusting method and a rolling mill by a rolling mill in which the upper and lower roll assemblies support the work roll by a divided backup roll divided into three or more in the axial direction.

  In recent years, rolling mills that can measure the load distribution of split backup rolls and estimate the load distribution between the rolled material and the work roll, and thereby estimate the sheet crown and plate shape after rolling have attracted attention ( For example, see Patent Document 1).

In the shape control of the rolling mill, the accuracy of rigidity of the divided backup roll system greatly affects the plate shape. Therefore, a method has been proposed in which the displacement and load distribution of each divided backup roll are measured in a kiss roll tightened state, and the rigidity of the divided backup roll system is accurately obtained based on these measured values (see, for example, Patent Document 2). ).
Japanese Patent Laid-Open No. 5-69010 (page 3, FIGS. 1 and 2) JP-A-8-192205 (first page)

  In the rigidity measurement method, when the roll axes intersect and the lower work roll comes into contact with the kiss roll being tightened, a thrust load is generated on the upper and lower work rolls due to the drive rotation of the work roll. Due to this thrust load, the upper and lower work rolls move in the direction of the roll axis, and the split backup roll at the end and the work roll may not come into contact with each other during the measurement operation for a long time. It also affects the load measurement of the split backup roll. As a result, there is a problem that highly accurate kiss roll tightening data cannot be obtained.

  In addition, if there is a deviation (offset) along the rolling direction between the upper and lower work rolls in the kiss roll tightened state, an accurate load distribution cannot be obtained. Furthermore, if the plate material is rolled with an offset, the rolled material may be warped.

  The method for measuring the rigidity of the rolling mill has been described above, but an accurate setup cannot be obtained if there is a work roll crossing or offset even in the setting up of the rolling mill. As a result, troubles such as defective dimensions and shapes and further interruption of rolling occur.

  An object of the present invention is to provide a work roll position adjusting method and a rolling mill that can easily make the crossing angle or offset of the upper and lower work rolls within an allowable range.

  The work roll position adjusting method for a rolling mill according to the present invention has a mechanism for supporting the upper and lower work rolls by a divided backup roll in which at least one of the upper and lower roll assemblies is divided into three or more parts in the axial direction. In the method of adjusting the work roll position in a rolling mill equipped with an independent rolling device, a load measuring device, and a rolling position measuring device, at least each of the divided backup rolls of either the upper or lower roll assembly is at least upper or lower. For any one of the work rolls, the thrust load acting in the roll axial direction is measured, and the reduction position of the divided backup roll is adjusted based on the measured value of the thrust load, and at least one of the upper and lower work rolls By giving rigid rotational displacement (skew angle) in the horizontal plane to It is characterized by holding the increase or decrease in thrust forces over crawl constant.

  Furthermore, the work roll position adjusting method of the present invention measures the load of each divided backup roll in the work roll position adjusting method, and calculates the sum of the loads of the upper and lower respective input side divided backup rolls and the load of the outgoing side divided backup roll. Adjust the reduction position of each split backup roll so that the total is within 5% of the total value of the split backup roll load, and give the lower work roll a rigid body displacement in the horizontal plane. It is characterized in that the offset is maintained within an allowable range.

  The rolling mill of the present invention is a rolling mill for carrying out the work roll position adjustment method, and each work roll is provided with a thrust load measuring device for measuring a thrust load acting on the work roll in the roll axis direction. It is characterized by.

  According to the work roll position adjustment method of the present invention, the rolling load of the divided backup roll is adjusted, and the crossing angle and offset of the lower work roll are set within the allowable range. Therefore, the thrust load can be easily adjusted. In addition, split backup roll system rigidity measurement or rolling mill setup can be performed with the work roll crossing angle and offset within the allowable range, and high precision and lower split backup roll system rigidity can be obtained. The rolling mill can be set up accurately. As a result, it is possible to produce a high-quality plate having excellent dimensions and shape.

  In the rolling mill of the present invention, each work roll is provided with a thrust load measuring device that measures a thrust load acting on the work roll in the roll axis direction. Therefore, based on the measured value obtained by the thrust load measuring device, the upper and lower The crossing angle of the work rolls can be within an allowable range.

  FIG. 1 and FIG. 2 show an embodiment of the present invention, FIG. 1 is a side view of a plate rolling machine that implements the work roll position adjusting method, and FIG. 2 shows the arrangement of the upper work roll and the divided backup roll. FIG.

  In the plate rolling machine 8, a main reduction device 17 and a main load measuring device 18 are provided in the housing 9. An upper inner housing 15 and a lower inner housing 45 are provided in the housing 9. The upper inner housing 15 is disposed so as to be movable up and down by a main pressure reducing device 17.

  An upper roll assembly 10 is provided in the upper inner housing 15. The upper roll assembly 10 is provided with divided backup rolls 21 to 27 and supports the upper work roll 13. The upper work roll 13 is provided with a thrust load measuring device 14. In addition, independent load measuring devices 321 to 327 and reduction position measuring devices 341 to 347 are provided for the respective divided backup rolls 21 to 27. In the figure, reference numerals 301 to 307 are examples of a reduction device arranged independently on each of the divided backup rolls 21 to 27. As shown in FIG. 2, three entrance-side split backup rolls 22, 24, 26 and four exit-side split backup rolls 21, 23, 25, 27 are alternately arranged in the roll axis direction.

  Similarly, a lower roll assembly 40 is provided in the lower inner housing 45 to support the lower work roll 43. The lower work roll 43 is provided with a thrust load measuring device 44. The lower roll assembly 40 includes divided backup rolls 51 to 57, reduction devices 601 to 607, load measurement devices 621 to 627, and reduction position measurement devices 641 to 647. The arrangement of the inlet side divided backup rolls 52, 54, 56 and the outlet side divided backup rolls 51, 53, 55, 57 is the same as that of the upper inner housing 15. The upper divided backup rolls 21 to 27 and the lower divided backup rolls 51 to 57 are vertically symmetric.

  In the plate rolling machine configured as described above, the work rolls 13 and 43 may cross and come into contact as shown in FIG. 3 during the kiss roll tightening operation. When the work rolls 13 and 43 are rotationally driven in such a state, a thrust load is generated on the work rolls 13 and 43, and the work rolls 13 and 43 move in the roll axis direction. In the example of FIG. 3 (in the drawing, PL is the rolling direction), the upper work roll 13 is rotated obliquely upward along the roll axis L1 with the roll axis L1 rotating in the clockwise direction. The lower work roll 43 moves obliquely downward with the roll axis L2 rotating counterclockwise. At this time, a tensile load acts on the upper work roll 13 and a compressive load acts on the lower work roll 43. The direction of rotation of the roll axes L1 and L2 of the work rolls 13 and 43 can be known from the tensile load or the compressive load, that is, the acting direction of the thrust load.

  Depending on the acting direction of the thrust load, the reduction positions of the divided backup rolls 21 to 27 and 51 to 57 are adjusted so as to cancel these thrust loads, and rotational displacement is given to the upper and lower work rolls 13 and 43. For example, in order to give a counterclockwise rotational displacement to the upper work roll 13 in FIG. 3, the divided backup rolls 26 and 21 shown in FIG. 2 are pushed out (lowered), and the divided backup rolls 22 and 27 are moved back (upped). And the reduction positions of these divided backup rolls 21 to 27 are adjusted. When adjustment of the reduction position is excessive and the acting direction of the thrust load is reversed, the reduction position of each of the divided backup rolls 21 to 27 is readjusted to give a rotational displacement in the opposite direction. By repeating these adjustments, the thrust load is gradually reduced so that the crossing angle of the work rolls is 0, that is, the upper and lower work roll rolls 13 and 43 are parallel or within an allowable range.

  Next, a method for setting the offset within the allowable range when there is an offset in a state where the upper and lower work rolls 13 and 43 are parallel to each other will be described.

  FIG. 4 shows a state where the upper and lower work rolls 13 and 43 are parallel, but offsets d1 and d2 are generated. If the offset measurement value is outside the allowable range, the load of each of the divided backup rolls 21 to 27 is measured, and the sum of the loads of the input divided backup rolls 22, 24, 26 and the divided divided backup rolls 21, 23, 25, The reduction positions of the divided backup rolls 21 to 27 are adjusted so that the total load of 27 becomes equal. For example, when adjusting the offset of the upper work roll 13 in FIG. 4, the exit side split backup roll backup rolls 21, 23, 25, 27 shown in FIG. 2 are pushed out, and the entrance side split backup rolls 22, 24, 26 are moved backward. Adjust the reduction position. By adjusting the reduction position, the work roll 13 is displaced rigidly in a horizontal plane, the roll axis L1 of the work roll 13 coincides with or substantially coincides with the roll reference axis L0, and the offset is 0 or within an allowable range. The lower work roll 43 is also operated in the same manner as described above, and the offset is set to 0 or within an allowable range.

It is a side view which shows the plate rolling machine provided with the upper division | segmentation backup roll while enforcing the method of this invention. It is a top view which shows arrangement | positioning of the division | segmentation backup roll of the plate rolling machine shown in FIG. It is a top view which shows typically the state which the roll axis | shaft of the upper and lower work rolls crossed. It is a top view which shows typically the state which the offset produced in the upper and lower work roll.

Explanation of symbols

8 Split backup roll type plate rolling machine 9 Housing 10, 40 Roll assembly 13, 43 Work roll 14, 44 Thrust load measuring device 15, 45 Inner housing 17 Main reduction device 18 Main load measuring device
21-27 Upper division backup roll 301-307 Upper division backup roll reduction device 321-327 Upper division backup roll load measurement device 341-347 Upper division backup roll reduction position measurement device 51-57 Upper division backup roll 601-607 Upper division backup Roll reduction device 621 to 627 Upper division backup roll load measurement device 641 to 647 Upper division backup roll reduction position measurement device

Claims (3)

At least one of the upper and lower roll assemblies has a mechanism for supporting the upper and lower work rolls by a divided backup roll in which at least one of the upper and lower roll assemblies is divided into three or more in the axial direction. In each of the divided backup rolls, the work roll position adjusting method in the rolling mill provided with the independent reduction device, the load measurement device, and the reduction position measurement device, and at least one of the upper and lower work rolls is in the roll axial direction. The thrust load acting on the surface is measured, the reduction position of the divided backup roll is adjusted based on the measured value of the thrust load, and at least one of the upper and lower work rolls is given a rigid rotational displacement (skew angle) in the horizontal plane. Therefore, the increase and decrease of the thrust force of the upper and lower work rolls is kept constant. Work roll position adjusting method of a rolling mill, characterized in that. Measure the load of each split backup roll so that the sum of the loads on the upper and lower input split backup rolls and the sum of the loads on the outgoing split backup rolls are within 5% of the total split backup roll load. 2. The offset of the upper and lower work rolls is maintained within an allowable range by adjusting a reduction position of each divided backup roll to give a rigid body movement displacement in a horizontal plane to the lower work roll. A method for adjusting the work roll position of a rolling mill. A rolling mill for carrying out the work roll position adjusting method according to claim 1 or 2, wherein each work roll is provided with a thrust load measuring device for measuring a thrust load acting on the work roll in a roll axial direction. A rolling mill characterized by that.

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